If you entered Google's new lottery system for I/O 2014, go check your email account. Odds are pretty good that you've got an email, or that you will receive one shortly. Several Google+ users are showing off their fancy invitations. Those who have "won" the right to purchase their $900 tickets have already been charged via their Google Wallet accounts.
Source: Bao-Long Nguyen-Trong, Google+
And if you didn't get in?